Stock feeding mechanism for punching, stamping, and cutting machines



Oct. 7, 1947. 2,428,493

STAMPING AND CUTTING MACHINES J. HALLER STOCK FEEDING MECHANISM FQRPUNCHING,

s Shets-Sheet 1 Filed Feb. 8, 1945 0 v m w mfl 3 a $1 3 mun JQHALLEROct; 7, 1947.

STOCK FEEDING MECHANISM FOR "PUNCHING, STAMPING, AND CUTTINGIMACHINESFiled Feb. 8, 1945 6 Sheets-Sheet 2 Gttomegs J. HALLER 2,428,493

STOCK FEEDING MECHANISM FOR PUNCHING, STAMPING, AND CUTTING MACHINES IOct. 7, 1947.

e Sheets-Shet 3 Filed Feb. 8, 1945 Zhwentor j atbmegs HALLER 2,428,493

STOCK FEEDING MECHANISM FOR PUNCH I NG, STAMPING, CUTTING MACHINES Oct.7, 1947.

e SheetsShet 4 Filed Feb. 8, 1945 wk 8?. W W A RE 4 n mvw wvw mum haw ml7 NW J. HALLER 2,428,493

STAMPING, AND CUTTING MACHINES Oct. 7, 1947.

STOCK FEEDING MECHANISM FOR PUNCHING,

e Sheets-Shet 5 Filed Feb. 8, 1945 ZSnnentor 26%? Gttornegs J. HALLEROct. 7, 1947.

STAMPING, AND CUTTING MACHINES STOCK FEEDING MECHANISM FOR PUNCHING,

Filed Feb. 8, 1945 6 Sheets-Sheet 6 Patented Oct. 7, 1947 srocx FEEDINGMECHANISM FOR PUNCH- AND CUTTING MA- ING, STAMPING, CHINES John Haller,Northville, Mich.

Application February 8, 1945, Serial No. 576,821

The present invention relates to improvements in automatic feedingmechanism for cutting, punching and stamping machines, and moreparticularly, to a feed mechanism for feeding strips of stock betweenthe die members of said cutting, punching and stamping machine.

The primary object of the invention is to provide an intermittent feedmechanism for stamp ing, cutting and punching machines which is operatedhydraulically by the reciprocation of the ram head of the machine andarranged to intermittently feed strip stock of various lengths betweenthe die members of said machine so as to facilitate the cutting,punching and stamping of blanks of different sizes and shapes.

Another object of the invention is to provide a feed mechanism forcutting, punching and stamping machines which is adapted to be operatedhydraulically by the movement of the ram head of said machine in such amanner as to cushion and eliminate shock and vibration at the ends ofthe reciprocating stroke of the feed mechanism and thereby preventdamage to the reciprocating feed mechanism when the same is operated. v

Another object of the invention is to provide a feed mechanism forcutting, punching and stamping machines in which a nicety of control isobtained in the feeding of the strip stock between the die members Ofsaid machine so as to permit the cutting, punching and stamping of amaximum number of blanks without wasting material and thereby creating asaving in machine operation.

Another object of the invention is to provide a feed mechanism which ishydraulically operated by the ram head of the cutting, punching andstamping machine in which the stock feed movement is varied byincreasing or decreasing the length of the' feed motor stroke andsimultaneously adjusting the position of stop members engageable with astop member mounted on the reciprocating feed carriage in such a manneras to cushion the piston of the feed motor at the end of its strokeprior to engagement of the stop members by the stop member carried bythe reciprocating carriage.

Another object of the invention is to provide a feed mechanism forcutting, punching and stamping machines in which the feed mechanism isoperated hydraulically by the reciprocating ram head of said machine andadapted to be governed by a uniquely arranged double-acting pumpmechanism connected in driven relation 24 Claims. (Cl. 164-117) with oneram head so that the stroke of the pump may be varied or adjusted.

Another object of the invention is to provide a hydraulically operatedfeed mechanism for cutting, punching and stamping machines in which thedouble-acting pump is provided with means for replenishing the motivefluid in the system so that the proper amount of fluid will bemaintained in said system and extreme accuracy may be had in the feedingmovement of the stock feed between the die members of said machine.

Another object of the invention is to provide a hydraulically operatedfeed mechanism for cutting, punching and stamping machines having anintermittent gripping device for engaging the stock and feeding the samebetween the die members of the machine which is positive in operationand may be adjusted to vary the gripping action on the stock being fed.

Another object of the invention is to provide a hydraulically operatedautomatic feed mechanism for punching, stamping and cutting presses ofthe type as above set forth in which a reservoir is provided in thehydraulic system for maintaining a sufficient amount of motive fluid inthe hydraulic system to increase efficient operation of the feedmechanism and to provide means associated with said reservoir forplacing the motive fluid in said reservoir under pressure so that thesystem will be completely filled during the operation of the machine andfeed mechanism.

Another object of the invention is to provide an automatic hydraulicallyoperated feed mechanism of the character set forth in which a bypassvalve is arranged between the pistons of the pump and reservoir so thatexcess fluid in said hydraulic system will be returned to said reservoirand damage to the machine prevented from excessive pressures built up insaid system.

Another object of the invention is to provide an automatic feedmechanism of the above-mentioned type in which the pump connection withthe ram head can be adjusted in accordance with the stroke of the feedmotor so that said pump will be regulated to supply a volume of liquidto the motor cylinder slightly greater than the volume of said cylinder.

Another object of the invention is to provide a fluid transmissionsystem for feeding mechanisms and the like in which the fluid motor isprovided with a pair of pistons arranged for adjustment relative one tothe other whereby the stroke of said motor may be regulated by than thelinear dimension of the motor cylinder,

Other objects and advantages of the invention will become apparentduring the course of the following description of the accompanyingdrawings, wherein:

Figure 1 is a top elevational view of the intermittent feed mechanismfor cutting, punching and stamping machines showing the arrangement ofthe various parts;

Figure 2 is a longitudinal cross-sectional view taken on line 2-2 ofFigure 1 looking in the direction of the arrows to illustrate in detailthe various features of the intermittent feeding mechanism and themanner in which the stroke of the motor piston may be variedsimultaneously with the adjustment, of the stop members;

Figure 3 is an end elevational view of the feed:- ing mechanism forcutting, punching and stamping machines, illustrating the manner inwhich a piece of strip stock is guided thereon, and the gearing foradjusting the stroke of the motor piston and stop members;

Figure 4 is a longitudinal cross-sectional view taken on line 4-4 inFigure 2 looking in the direction of the arrows to illustrate various details of construction of the feed carriage and gripping device as wellas the manner in which fluid is admitted to the opposite ends of themotor cylinder;

Figure 5 is an end elevational view of the intermittent feed mechanismshowing the adjustable actuator arm for the hydraulic pump which isadapted to be connected to a reciprocating ram head of the cutting,punching and stamping machine; I

Figure 6 is a vertical cross-sectional view taken on line 66 of Figure 2looking in the direction of the arrows and showing in detail the variousfeatures embodied in the pump structure for the hydraulic system;

Figure 7 is a horizontal cross-sectional view taken on line 7-1 inFigure 6 looking in the direction of the arrows and showing one of theby-pass valves as associated with the reservoir of the pump;

Figure 8 is a Vertical cross-sectional view taken on line 8-8 of Figure2 looking in the direction of the arrows and further illustratingindetail the construction and arrangement of the stock gripping member forgripping the strip stock and advancing the same forwardly beneath thedie members of the cutting, punching and stamping machine;

Figure 9 is a vertical cross-sectional view taken on line 99 of Figure 2looking in the direction of the arrows and showing the manner in whichthe stock gripping carriage is slidably mounted by the frame of the feedmechanism as well as the manner in which one of the stop members may belocked in frictional engagement with the adjusting screw therefor;

Figure 10 is a vertical cross-sectional view taken on line |lll0 ofFigure'2 looking in the direction of the arrows to illustratethe stockgripping roller for preventing retrograde movement of the stock upon thereturn stroke of the stock feeding and gripping carriage;

Figure 11 is a fragmentary cross-sectional view taken on line H|l ofFigure 10 showing one of the frictional gripping clutchrmembersassociated with the gripping roll'for permitting forward feeding of thestock and locking the stock upon return movement of the grippingcarriage;

Figure 12 is an enlarged fragmentary crosssectional view of the pistonstructure and stop adjusting screw for the motor structure;

Figure 13 is a longitudinal cross-sectional View similar to Figure 2showing the manner in which the piston stroke may be adjusted for afluid motor and the manner in which the stop members may be adjustedbetween the carriage and adjust ing screw;

7 Figure 14 is a front elevational view of the feed mechanism embodyingthe invention, illustrating the same attached to a reciprocating ramhead type punching, cutting and stamping machine for feeding strip stockbetween the die members thereof; 7

Figure 15 is a vertical cross-sectional view taken on the irregular line15-[5 in Figure 14, showing the manner in which the ram is drivinglyconnected to the actuator pump and the manner in which the stroke ofsaid pump maybe adjusted;

Figure 16 is a fragmentary cross-sectionalview of a modified form of theinvention showing a slightly different pump construction for the hy-'platform 5, reciprocating ram 6 and ram guide frame I. Die members 8 and9 are secured. to the bolster platform 5 and ram head 6 in the usualmanner so that material fed therebetween will be cut, stamped or punchedby said die members.

The invention embodies an automati intermittent feeding mechanism forfeeding stock betweensaid die members 8 and 9 and includes a base I0having opposed flange portions l 1 adapted to be bolted to the bolsterplatform 5 by means of bolts or the like l2 which extend" throughapertures l3 in said flanges II and have their ends threaded in suitableopenings in the top surface of the bolster platform 5.

Formed integral with the base I0 is a casting which includes verticalwall members M which are spaced a sufficientdistance apart to provide apassageway I5 for permitting the advancement of the stock'therebetween(Figures 5 and6)'. The passageway i5- is reduced tov provide-verticalwall portions it having V-shaped guideways I1 for' receiving a feedcarriage t8. Guide ribs I 9 are formed on the longitudinal edges of thefeed car'- riage for reception in the V -shaped guideways' Fla The sidewall portions l4 terminate at one end in an integral casting providingacylinder renewing cylindercaps 2] and 22 fastened to the ends thereofby. means of screws or other fastening elements and the cylinder cap 2|is provided with a slide bearing portion 23' for sliolably receivingthereof so that a nut 3| will hold the washer against the shoulder ofthe reciprocating plunger rod and provide an abutment member during thereturn motion of the reciprocating plunger rod 24 and stock feedcarriage IS.

The stock feed carriage I8 is chambered as at 32 for receiving agripping dog 33 which is pivotally mounted upon a pivot pin 34 in such amanner as to permit the stock gripping dog 33 to rock about the pivotpin 35 and force the knife-like edge 35 carried thereby into engagementwith the stock S during the forward movement of the plunger rod 24 andfeeding carriage 18. The upper portion of the feeding carriage I8 iswidened as at 36 and is provided with vertical wall portions 3? betweenwhich is mounted a top wall member 33 which is held in place by suitablescrews or the like. The front and rear edges of the cover member 38 arespaced a slight distance from the top wall of the feed carriage toprovide passageways 39 and 3-6 respectively for the assage of stock S.The undersurface of the top wall 38 is inclined as at il for slidablyreceiving a gripping block 43 having laterally extending tongues 44 forbeing received in grooves 45. A limiting stop 45 extends upwardly fromthe gripping block as and operates in a slot 3'! of the top wall member38 so as to limit the stop against movement. An adjusting screw 23 is ina suitable opening in the rear portion of the cover member 38 and hasits inner end threaded into the adjustable gripping block 33 so thatsaid block may be adjusted to any desired position and held therein bymeans of a lock nut 55. It will thus be seen that the gripping block maybe adjusted to any desired position so as to regulate the space betweenthe lower surface thereof as at 50 relative to the stop and theknife-like edge 35 of the stock-gripping dog 33.

The reciprocating plunger 24 is provided with a transverse opening 55for receiving the head 52 of the pivoted gripping dog 33 so that forwardmovement of the reciprocating plunger 24 will cause the gripping dog tobe shifted into engagement with the stock until the enlarged portion 28on the plunger rod engages the feed carriage l8. On the return stroke,the knife-like edge 35 of the gripping dog 33 is retracted and thewasher 30 abuts the feed carriage l8 after a slight movement between thecarriage and plunger and thereby retracts said carriage to its startingposition.

A portion of the reciprocating plunger rod 24 is of tubular constructionhaving a bore extending inwardly from the piston end 2'! for receiving athreaded tubular extension 55 formed on an adjustable piston'55, Thetubular extension 54 passes through a nut member 55 mounted in thepiston 26 so that rotation of the piston 55 relative to the piston 25will cause the piston to be separated as shown in Figure 13. The pistoncap 22 is provided with a bearing opening 51 through which extends arotary shaft 58 so that the shaft will project through an opening 59 inthe piston 55 and extend into the tubular threaded portion 54 of thepiston 55 (Figure 12). Formed on the rotar shaft 58 is a longitudinalkeyway 68 for receiving a gib or key 5| anchored in the piston 55 so asto permit relative sliding movement between the piston 55 and :o-

tary shaft 58, but yet prevent relative rotational movement. A collar 62is keyed to the rotary shaft 58 by means of a transversely extending key63 so as to rotate with said shaft and provide a stop member therefor toprevent endwise 6 movement of said shaft during the adjustment of thepistons 26 and 55 relative to one another. Affixed to the free end ofthe shaft 58 is the hub 64 of a gear wheel 65 which is adapted to meshwith a gear wheel 65 having its hub 61 affixed to a shaft 68 journaledin a suitable bearing opening 69 in the cylinder cap 22 and arranged soas to pass through a depending boss it? formed integral with thecylinder 29. The shaft 68 is slightly enlarged and provided with ascrew-threadedportion H which terminates in a bearing portion 12 whichextends through a bearing opening in a depending boss 13 formed integralwith the other end of the cylinder 28. The shaft 68 is provided with anenlarged threaded portion M slightly greater in diameter than theportion H and said threaded portion terminates in a reduced bearingportion 15 journaled in a cross arm 16 extending between the side wallsof the base and aflixed thereto by screws or the like as at 11.

It will thus be seen that rotation of the shaft 58 may be accomplishedby applying a crank or the like to the polygonal-shaped end 11 of theshaft 63, and upon rotation of said shaft, the screw-threaded portions Hand 14 will be rotated as will also the shaft 58 so as to feed thepiston 25 along the tubular portion 54 thereof. In this manner thepistons 26 and 55 may be adjusted or separated a predetermined distanceto produce the desired length of feed stroke.

Slidably mounted beneath the piston casting 2B is an indicator bracket13 having an enlarged end portion provided with a threaded bore forbeing threadedly received upon a screw shaft H. The indicator bracket 78slidably engages the flattened portion of the underside of the cylindercasting 20 to prevent rotation thereof and said indicator arm i8 isadapted totravel, in unison with the piston 26 when the shaft 68 ismanually rotated. Similarly, a stop nut is is provided with a threadedbore and is threadedly received on the threaded enlarged portion 14 ofthe shaft 68 so as to likewise travel along in unison with the piston 26and indicator bracket 18 when the shaft 58 is rotated. During theforward travel of the feed carriage l8, a stop projection 19 on theunderside thereof is adapted to engage the cross arm 16 so as to limitthe forward feeding movement of said feed carriage and upon the returnstroke of said carriage, the depending stop projection 19' will engagethe stop nut 19.

The stop nut 19 is provided with a pair of guide ribs 19" which areslidably mounted in suitable ways in the vertical walls l4 arranged inopposed relation. The stop nut 19 is split inwardly from one end thereofand extending diametrically of the threaded opening therein so as tofacilitate clamping of said nut upon the threaded portion 14 of therotary shaft when a rotary locking knob 79 is rotated into clampingengagement with one of the guide ribs 19" by a manual control levershown in dotted lines. The rotary locking rod 19" is provided with aflattened portion exposed to the guide ribs 19 so that rotation of therod will clampingly engage the underside of said guide ribs 19" andthereby lock the lock nut 19 to the base or casting as well as to thescrew-threaded shaft 14. movement of the feed carriage IS the stop nut19 is engaged by the stop projection 19 on the feed carriage which, asstated above, is adjusted to any desired position to produce therequired feed carriage stroke by rotating the shaft 68.

In order to cushion the pistons 25 and 55 as well as the reciprocatingplunger rod 24 against shock,

During the return the cylinder cap 2| is provided withan enlarged bore88 for receiving an enlarged portion 25 or the piston 26 so as to trap aslight amount of fluid therein which is allowed to return to thecylinder chamber 20 through a radially extending bore 81' and bleed duct82 having communication therewith. The passageway between the radiallyextending bore 8| and bleed duct 82 may be controlled by ascrew-threaded plug 83 having an end portion 8A which projects into saidbore 81 and restricts the passageway between said bore and bleed duct82. Similarly, the piston cap 22 is provided with an enlarged bore 85for receiving the enlarged tubular portion 8'5 on the piston '55. Aradial bore '8? communicates with the enlarged bore 85 and permits thefluid trapped in said enlarged bore to bleed back to the piston cylinderthrough a bleed port 88. A control screw 89' is threaded in the radiallyextending bore '8"! and is provided with a projection 90 for restrictingthe fluid passageway between said bore and bleed duct 8'8 insubstantially the same manner'as pointed out and described in connectionwith the adjustable threaded plug 83.

Extending transversely of the cylinder casting 28 is a guideway 9| forreceiving a pair of slides "9 2 arranged in opposed relation and spacedapart so that guide rollers 93 may be rotatably mounted on said slides'92 by means of headed pivot pins or bolts 94. Locking screws 95 arethreaded in wing extensions 96 of said guide or way 9| to engage theunderside of the slide 92 and thereby hold said slide in a predeterminedadjusted position.

Formed on the top wall of the casting '20 forwardly of the transverselyextending slideway 91 is a transversely extending platform 97 the endsof which extend beyond said cylinder and the top wall 98 of saidplatform is substantially flat to provide a rest or support for thestrip stock S being fed between the die members of the punching,stamping and cutting machine. Formedintegral with the platform 9'! atthe ends thereof is a pair of oppositely disposed upstanding lugprojections '99 to which is 'pivotally attached an adjustable rollerhousing Hill. The roller housing is provided with a hinge extension H3!which is mounted between the upstanding lugs 99 and is fastened theretoto swing about a hinge pintle 582. Side walls I03 are formed on theroller housing Hi0 and'are provided with bearing bosses N14 forreceiving a shaft I505. The shaft may be locked in position bytransversely extending locking keys we and ro'ta'tably mounted on theshaft 185 is a stock engaging gripping roller I'M by means ofanti-friction bearingmemvbe'rs IE8 at each end thereof to permit free.unidirectional movement of said roller in the direction of stockmovement. The ends of the cy1 inder or roller Ill! are closed byscrew-threaded plugs I99 and mounted between the anti-friction bearingits and threaded plug M39 at one end of the roller is a roller clutch toprevent rotation of the roller ml in a direction opposite the directionof stock feed movement. The roller clutch includes a ratchet shapedwheel H0 keyed to the shaft 195 by means of a gi-b orkey :l-H to "remainstationary, and a series of balls H2 are interposed between the teeth H3of the ratchet wheel H9 and the inner periphery of the roller iii-7 soas to frictionally engage said inner peripheral surface and preventrotation of the roller Iii! in a directionopiposite the direction ofstock feed movement. The roller housing '8 and groller 1011 are adaptedto be yieldingly'urged into engagement with the stock S by means of anadjusting bolt H4 which is threadedlymounted in a yoke member I I5integrated with the 'pi'ston casting 20 and arranged so as to engage aprojection HF carried by the housing I00 and extending beneath the crossarm of said yoke member HE. A coil spring H1 is received in a recessformed in the projection H6 and has one of its ends abutting the floorof the recess and the opposite end engaged by the adjusting bolt ii i sothat rotation of the adjusting nut will increase or decrease the tensionon the spring and similarly increase or decrease the pressure on thefriction-gripping roller 101. A lock nut HBis mounted on the adjustingbolt I14 to maintain the same in an adjusted position.

In order to determine the amount of adjustment imparted to the stop nut19, an extension arm iii? is formed on the indicator bracket. 18 whichhas an upstandingindicator pointer I20 affixed thereto by a screw or thelike I21, and said indicator pointer is adapted to register withvgraduations on an indicator scale bar I22 which has its ends affixed tothe cylinder casting 20 "by screws or the like .523 at each end thereof.

Extending between the upper portions of the side walls I4 and formedintegral therewith is a cylinder casting [2'4 to provide a cylinderchamber I25 in which is mounted for reciprocation a pair of differentialvalved pistons I26 and 127. Formed integral with the cylinder castingI24 is a reservoir housing I28 for providing a reservoir chamber I29which has communication with the cylinder chamber through an openingslot 136. The pistons I26 and I21 are hollow and provided with pistonports l3! and ['32 respectively which are adapted to be controlled by adouble- :en-ded valve member 133 having .seating portions ice and iadapted to alternately seat and close the ports IBI and I332. Thedouble-ended valve member 133 .is provided with a central reducedportion 13% forming enlarged shoulder portions 431 and [328 which areadapted to engage slide guides 139 and Mt mounted in the hollow pistonsI26 and i2 1 respectively. Slight movement of the double-ended valvemember 13-3 is thus permitted before the ports l3! and 132' are closedon the return stroke of the piston, and similarly, slight movement ofthe double-ended valve member I33 is provided for when the pistons aremoved in the opposite direction. That is to say, when the-piston I26 isbeing returned from "the end of the cylinder shown in Figure '6 to theop- 'posite end of the cylinder chamber I725, the shoulder formed by theenlarged portion 131 on the double-ended valve member 133' will engage'the'slide guide 139 and move the piston after the port I 31 has beenopened. A similar operation occurs 'with'respect to the piston] 21'. V

Formed intermediate the ends of'the doubleended valve member I33. is atransverse slot Mil which is adapted to receive the free end of theoscillating crank arm 1'42' having its hub portion Hi3 mounted on arock-shaft I'M. The ends of the rock shaft Hi l are journaled insuitable hearing openings I 25 in tubular bearing bosses MB formedintegral with the reservoir housing 128.

'One'of the tubular bearing bosses I46 is provided with a threadedopening 14*? for receiving the screw-threaded end or a fitting M8 havingan enlarged. bore lddarranged so as to establish communication between adash pot structure F511 I200 -75 and the reservoir chamber through a em15!.

Reciprocably mounted in the dash pot I50 is a piston I52 having aplunger rod I53 extending through the dash pot and provided on its outerend with a manual control rod I54. A coil spring I55 is housed in thedash pot I50 to load the plunger I52 and thereby place the reservoirchamber under a predetermined pressure load.

Mounted on the other end of the rock shaft I44 and keyed thereto is acollar I56 which is provided with a hub portion I51 having armextensions I58 and I59 arranged as shown in Figure 5. The free ends ofthe arm extensions I58 and I59 are provided with threaded bosses I60 andIt respectively for receiving adjustable screw members I62 and I63respectively, the ends of which are adapted to be engaged by a lever armI64 which has its hub portion I65 received on the collar I56 to rotatefreely thereon. The hub portion I65 is retained in position by a keeperplate I61 held in place by a retaining bolt I68 threaded in a suitableopening in the end of the rock shaft I44. The free end of the lever armI64 is provided with a pair of parallel flanged portions I68 at eachside thereof for slidably receiving a slide block I 69 which carries apin I10 (Figure 1) which is adapted to be slidably mounted in a slot I1Iin the end of said oscillating lever I64. One end of the pin I10 isreduced as at I1I for receiving a retaining nut I12 and thereby lock thepin I10 in the longitudinal slot I1I'. The opposite end of the pin I10is enlarged to provide a bearing surface for receiving a roller I13which is adapted to be held in place upon the pin I10 by a retainingplate I14 held in place by a retaining bolt I15. An indicator pointerI64 is attached to the lever arm I64 and is arranged so that the endthereof will register with a graduated scale I28 to facilitateadjustment of said arm I64 in accordance with the stroke of the motorpistons 26 and 55 desired.

Mounted on the ram head 6 is an angle bracket having a base portion I16held in place by machine screws or the like I11, and said angle bracketis provided with an offset portion I18 having a slot I19 for receivingthe roller I13 (Figure 15). Thus it will be seen that reciprocation ofthe ram head 6 will oscillate the lever arm I64 and impart correspondingoscillation to the piston arm I42 to cause the pistons I26 and I21 tomove from one end of the cylinder chamber to the other in accordancewith the reciprocating movement of the ram head.

In order to hydraulically transmit the movement of the pistons I26 andI21 to the pistons 26 and 55 in the cylinder casting 20, the side wallsI4 of the base I are cut away as at I80 and IBI to provide ports havingcommunication with the opposite ends of the cylinder chamber I25 andwith feed ducts I92 and I83 extending longitudinally of the base I0. Thefeed duct I82 terminates in the base casting I0 at one end in alaterally extending portion I84 which has communication with theleft-hand end of the cylinder casting 29 as shown in Figure 4. The otherfeed duct I 83 terminates at the other end of the cylinder casting 20 ina laterally extending passageway I85 (Figure 4). The laterally extendingpassageway I85 is connected to the feed duct or passageway I93 by meansof a longitudinally extending pasageway I86 formed in an integralportion I81 of the cylinder casting 20.

Closure plates I88 and I89 are aflixed to the side walls I4 by means ofscrews or the like as at I90 to cover the ends of the cylinder chamber25 and likewise cover the communicating ports 10 or ducts I and NH. Thusit will be seen that when the piston I26 has been moved to its fullstroke from the right hand end of the cylinder chamber 25 to theleft-hand end. fluid under pressure will pass through the port I80,communicating duct I82 and to one end of the cylinder casting 20 throughthe port I84, and return the plunger rod 24 to the position shown inFigure 2..

During this movement, fluid from the reservoir chamber I29 may passthrough the opening I30 and through the open port I32 in the piston I21to allow the right hand end of the cylinder chamber I25 to bereplenished with motive fluid so that when thepiston arm I42 is moved inits opposite direction with respect to that shown in Figure 6, the valveI 35 will close the port I32 and force the motive fluid in theright-hand end of the chamber I25 through the duct I8I. longitudinalpassa eways I83 and I86, and through the lateral port I to the oppositeend of the pistons 26 and 55. The pistons will thus be moved to theopposite end of the cylinder from the position shown in Figure 4 tocause the feed carriage I8 to grip the stock S and advance the samebeneath the die members of the punching, stamping and cutting machineupon the up-stroke of the ram head 6. During the down stroke of the ramhead, the stock is held by the friction gripping roller I01 and the feedcarriage is returned to the startin point of the feeding stroke.

Formed in enlarged bosses I92 in the reservoir housing I26 are threadedbores I93 which are adapted to receive removable tubular valve cages I94which have their upper ends threaded and provided with polygonalportions I95 to fac li tate insertion and removal of said valve cagesI94. The valve cages are adapted to rest upon valve seats I96 which arereceived in openings I91 in enlarged boss formations I98 extendinginwardly from the end walls of the reservoir casting I 28 (Figure '1).Ports I99 and 290 are formed in the casting at each end of the cylinderchamber I25 to connect the cyl nder chamber with the reservoir chamberI29 through the Va ve seat openings Slidably mounted in each of thevalve cages I94 is a valve plug 202 which has an enlarged portion 209rovided with longitudinally extending grooves 204 on the peri heralsurface thereof for permittin passage of flu d from the cylinder chamberI25 to the reservoir chamber I29. Coil springs 205 are mounted in thevalve cages I94 for urging the beveled port ons of the valve plugs202upon their seat members I96 and each of the valve ca es is provided withan opening 206 having communication with a reservoir chamber I29.Retaining rings 201 are mounted in the lowermost ends of the valve cagesI94 to prevent displacement of the valve plugs 202 when the valve cagesare removed from their threaded open ngs I93.

The coil springs 205 are of sufficient tension to yieldingly hold thevalve plugs 202 seated without permitting by-passing of the liquidthroughout the entire stroke of the pistons I26 and I 21 to therebyoperate the pistons 26 and 55 until said last-named pistons reach theend of their stroke and are stopped by the cross arm 16 or stop nut 19being engaged by the stop projection 19' on the feed carriage I8. Afterthe feed carriage has stopped, excess motive fluid in the cylinderchamber I25 is returned to the reservoir chamber I29 through the by-passvalve 292. In this manner the proper volume of operating fluid isinsured for each strrke of the pistons I26 and I21 so that the pistons26 and 55 will be operated'and caused to travel the exact distancerequired for V with theplunger I52 retracted against the action of thecoil spring I55 by holding the hand knob I54 manually, the closuremember 208 may be replaced and the hand knob I54 released so as to placethe operating fluid in the reservoir cham-v be! under a predeterminedpressure. This pressure is relatively slight in proportion to theoperating pressure produced by movement of the pistons I 26 and I2 I anddoes not affect the pistons 25 and 55. Thus the pistons I26 and I21 inthe cylinder chamber I 25 act as a pump to supply pressure fluid tooperate the motor consisting of the pistons 26 and 55 in the cylinderchamber 25..

Modifiedjorm of the invention shown in Figure 16 In the modified form ofthe invention shown in Figure 16, the side walls Me of the feedmechanism casting are connected by a cylindrical casting I24a to providea cylinder chamber I25a in which are reciprocably mounted valved pistonsI26a and IZ'Ia. Formed in the end walls of the pistons are opposed valveports I3-Ia and I32a which are adapted to be alternately opened andclosed by a double-ended valve member IBM. The valve member I360; isprovided with reduced end portions I3'Ia and I38a which are slidablyreceived in perforated guide discs I39a and Mfla. The ends of thedouble-ended valve member Idea are provided with valve plugs Ilda andI35a which are adapted to seat in beveled portions. of the valve portsISIa and I32a. The reduced portions 131a and I-38a of the double-endedvalve member are threaded as at 299 for'receiving stop nuts 210. Theoscillating lever arm out in connection with the form of the inventionshown in Figures 1 to inclusive and in doing so, it causes thedouble-ended valve member I36a IdZc is adapted to rock with the shaft IMia, as pointed carriage I8 to the beginning of its feed stroke, 7

I88a and I896! are secured to the side walls lea to close the ends ofthe cylinder chamber I250; and also close the grooves IBM and I8Ia. Thereservoir chamber 12 9a is adapted to be alternately connected with thecylinder chamber I2-5a upon the opening of the valve plugs I34a and I35athrough a slot: I 30a in the cylinder wall I240, and

r the oscillating lever M211 is received in a transversely extendingslot Idler in substantially the same manner as pointed out in connectionwith the. oscillating arm I42 and double-ended valve member I36 in theform of the invention shown in Figures 1 to 15 inclusive. By-pass portsI99a and Zlltld connect the opposite ends of. the cylinder chamber I25awith the reservoir chamber I29a by means of yieldingly seated valvemembers similar to those described in connection with the:

form of the invention shown in Figures 1 to 15 returned to the reservoirchamber and thereby I inclusive to permit excess operating fluid to :be

I2 maintain the proper amount of operating'fluid in the system. V

It is to be noted that the reduced portion I310 is slightly longer thanthe reduced portion I38a so as to permit a greater movement of thedoubleended valve member before the piston IZSa is retracted or returnedto the starting position of its pressure stroke, while only a slightmovement of the double-ended valve member I36a is necessary before thepiston I Z'Ia is retracted or moved to the starting position of itspressure stroke. This structure produces the same effect as thedifi'erential piston structure shown in connection with the form of theinvention in Figures '1 to 15 inclusive and allows the piston lzea tomove through a relatively short stroke but yet impart a stroke to thepiston I210, substantially equal to the entire movement of thedouble-ended valve member I36a. In other words, 'the'feed stroke of thepiston I2 la will communicate with the right-hand end of the cylindercasting 28 (Figures 1 to 15) so that the pistons 25 and 55 therein willbe forced to the left hand end of the cylinder casting 20 during thestock Jfeed movement of the gripping carriage I8, whereas during thepressure stroke of the piston IZSa to return the stock between the diemembers of the punching,

stamping and cutting machine. The piston I21a is shown in a position inwhich movement of the double-ended valve member I365; will close theport ISZa. and move the piston IZla to the right and force fluid underpressure through the groove o idle and through the passageways I83 andI86 (Figure 4') to the right hand end of the cylinder 2d and therebyforce the pistons 26 and 55 to the left as well as the feed carriage I8.Thus the pistons I260. and IZ'Ia in the cylinder chamber a act as a pumpto supply pressure fluid to operate the motor consisting of the pistons26 and 55 in the cylinder chamber 25.

Operation of the form of invention shown in Fig; 61138 1 to 15 inclusiveIn operation it will be assumed that the cast ing IE! is attached to thebolster platform of the punch press as shown in Figure 14 and the stockS has been threaded in place between the edge guiding rollers 93,friction gripping roller I 87 and through the slotted openings 39 and soin the feed carriage I8 so-thati one end of the stock will be presentedbetween the die members 8 and 9 (Figure 1 1). 7 r

A crankarm or other tool is applied to the polygonal end T1 of therotary shaftfl8 so as to adjust the pistons 25 and 55 to the requiredlength of stroke and position the stop -mernber 719 along the threadedrod It to stop the motion'of the feed carriage I8 during its returntravel. By'

reference to the graduated strip IZI and pointer arm I26, the required'feed motion Off the feed 13 tion so as to cause reciprocation of the ramhead 6. Upon reciprocation of the ram head, the oscillating piston armI42 is moved to and fro to cause the pistons I26 and I21 to reciprocatein the cylinder chamber I25. As shown in Figure 6, the piston 26 is inits starting position for placing the fluid under pressure in the righthand end of the cylinder chamber 25 so as to force fluid under pressurethrough the grooves It I, passageways I 83 and I86 (Figure 4) to theright hand end of the cylinder casting 20. The pistons are advanced inthe cylinder 25 to cause the slidable feed carriage It to move indirection of stock feed and during the initial movement of the pistons26 and 55, the plunger rod 24 is permitted to slide a slight amountrelative to the sliding feed carriage and thereby rock the gripping dogon a pivot pin 34 so that the knife-like edge thereof 35 will engage theunderside of the stock and tightly grip the same. When the enlargedportion 28 on the plunger rod has engaged the slidable feed carriage I 8upon continued movement of the plunger rod 24, said slidable feedcarriage I8 is moved to the left from the position shown in Figure 2 toadvance the stock S beneath the die members 8 and 9. The above movementtakes place during the upstroke of the ram head during its reciprocationand during the down stroke thereof the pistons I26 and I21 are moved tothe left-hand end of the cylinder chamber I25 or to the position shownin Figure 6 so as to force fluid under pressure through the groove I85,longitudinal passageway I82 and laterally extending port I84 to the lefthand end of the cy1- inder 26. As this occurs, the plunger rod 25 isretracted and the pistons 26 and 55 thereon are returned to theright-hand end of the cylinder 2!! or to the position shown in Figure 4.At each end of the stroke of the plunger rod 24 the pistons arecushioned by means of the enlarged portions 25 and tubular portions 86thereon which enter the annular chambers 86 and 85 respectively. Duringthe return stroke of the plunger rod 24 just described, said plunger rodis shifted to the right a slight amount before the washer 36 engages theslidable feed carriage I8 so as to rock the gripping dog 33 on its pivotpin 34 and retract the knife-like edge thereof 35 from engagement withthe stock S. Upon continued return movement of the plunger rod 2 3, thefeed carriage is returned to its initial position and the stock isgripped by the friction roller I61 so as to prevent retrograde movementof the stock. With the slidable feed carriage returned to the positionshown in Figure 2, the mechanism is arranged for the next feedingoperation of the stock S. In the event that excess operating fluid ispresent in either side of the system, it is by-passed to the reservoirchamber I29 as explained in connection with the description of theby-pass valve 252, and upon the return stroke of the pistons I26 andI21, the valve plugs I34 and I35 are unseated from their ports I3I andI32 so as to permit operating fluid to pass from the reservoir chamberand through the perforated guide rings I39 and I46 to the opposite sidesof the pistons. Upon the beginning of the pressure stroke, the valvesI35 and I35 are closed and trap the operating fluid in the cylinder I25.Thus, the cylinder chamber will be completely filled with operatingfluid at the beginning of the stroke to insure the movement of thepistons 26 and 55 through their complete stroke and after the carriageI8 has been stopped by the bridge member 16 and stop member 19,continued movement of the pistons I26 and I21 causes the 14 excessliquid to be returned to the reservoir chamber I29 through the by-passvalves 262.

When the adjustable gripping block 43 has become worn, the adjustingscrew 48 may be rotated to slide the block along the ways 55 andcompensate for the wear between the under sides of the block 43 and thestock S.

The yielding spring tension on the friction gripping roller I01 may beregulated by adjusting the adjusting bolt IM so as to exert the properpressure on the stock S so as to grip the same and prevent retrogrademovement of the stock during the return travel of the slidable feedcarriage I8. By manipulating the hand screw 95, the stock edge engagingrollers 93 may be moved toward or away from one another to accommodatestrip stock oi various widths within the range of the width of thefriction gripping roller I61.

If it is desired to vary the play between the arm extension I64 andoscillating piston lever I42, the adjusting screws I62 and I63 aremanipulated so that the arm extension I64 will move a predeterminedamount before imparting motion to the oscillating piston lever M2. Inthis manner, the oscillating arm projection I65 may be adjusted so as topermit reciprocation of the ram 6 a predetermined distance before thearm extension I64 engages one of the adjusting screws I62 and I63 andtransmits reciprocating motion of the ram head 6 to the oscillatingpiston-operating lever through the rock shaft I 54.

The screw plugs 83 and 29 may be adjusted so as to provide the propercushioning effect of the pistons 26 and 55 as they reach the end oftheir piston travel and by operating the rotary shaft 68, the pistons 26and 55 may be separated and be cushioned prior to the engagement of thestop projection 19 on the slidable reciprocating feed carriage I8 by thecross arm 16 and stop nut 19. Obviously, the shaft 68 may be rotated andadjusted to produce a high degree of precision movement of the stock Sin order to obtain the maxi mum number of stamp-ings or the like fromthe length of the strip stock S.

The system may be replenished from time to time by filling the reservoirafter the dash pot piston I52 has been retracted and other adjustmentshave been made to the feeding mechanism so as to facilitate a nicety ofcontrol over the feed movement of the stock such as the adjustment ofthe pin H0 in the slot ill to cause the pistons I26 and I21 to movethrough increased or decreased piston strokes in proportion to thereciprocating movement of the punching, stamping and cutting machine ram6.

Operation of the form of the invention shown in Figure 16 When the pumppiston structure shown in Figure 16 is substituted for that shown inFigures 1 to 15 inclusive, the operation is substantially the same andthe slidable feed carriage I8 is moved to and fro so as to grip and feedthe stock beneath the die members 8 and 9 of the punching, stamping andcutting machine. The only difference is greater movement of the pistonI26a to insure proper fluid pressure during the feed stroke of theslidable feed carriage without employing differential pistons as shownin connection with the form shown in Figures 1 to 15 inclusive. At theend of each piston stroke I26a and I21a, excess operating fluid isreturned to the reservoir chamber I28a through the bypass ports I99a and260a and through by-pass valves similar to the valves 262. The alternateopening 15' i and closing of the valves I 34a and [35a at the beginningand end of the stroke of the pistons I260, and Mia occurs insubstantially the same manner as pointed out in connection with thedouble-ended valve I36 (Figures 1 to 15 inclusive.)

It is to be understood that the forms of the invention herewith shownand described are to be taken as specific embodiments of the same andthat various changes may be made in the shape, size and arrangement ofparts without departing from the spirit of the invention or the scope ofthe appended claims.

What I claim is:

1. A feed mechanism for punching, stamping and cutting machines having aplatform and a reciprocating ram head, a support aflixed to saidplatform, a pump carriedby'said support having a double-acting pistonconnected to said ram head in driven relationship therewith, areciprocating stock feeding device slidably mounted on said support, amotor' carried by said support having a pair of adjustable pistonsdrivingly connected to said reciprocating stock feeding device, meansfor adjusting said pistons to regulate the stroke of said reciprocatingmember, and stop means engageable with said reciprocating stock feedingdevice to limit the stroke of said feeding device.

2. A feed mechanism for punching, stamping and cutting machines having aplatform and a reciprocating ram head, a support aliixed to saidplatform, a pump carried by said support having a double-acting pistonconnected to said ram head in driven relationship therewith, areciprocating stock feeding device slidably mounted on said support, amotor carried by said support having a pair of adjustable pistonsdrivingly con nected to said reciprocating stock-feeding device, meansfor adjusting said pistons to regulate the stroke of said reciprocatingmember, and stop 7 means engageable with said reciprocating stockfeeding device to limit. the stroke of said feeding device, said pistonadjusting means and stop means being operably connected to move iunison.

3. A feed mechanism for punching, stamping and cutting machines having aplatform and a reciprocating ram head, a support afiixed to saidplatform, a pump carried by said sup-port having a double-acting pistonconnected to saidram head in driven relationship therewith, areciprocating stock feeding device slidably mounted on said support, amotor carried by said support having a pair of adjustable pistonsdrivingly'c'onnected to said reciprocating stock feeding device,

means for adjusting said pistons to regulate the stroke of saidreciprocating member, and stop means engageable with said reciprocatingstock feeding device to limit the stroke of said feed ing device, saidpump being hydraulically connected with said motor and provided with areservoir chamber for replenishing the motive fluid in said system.

4. A feed mechanism for punching, stamping and cutting machines having aplatform and a reciprocating ram head, a support aifixed to saidplatform, a pump carried by said support having means for adjusting saidpistons to regulate the 'a double-@acting piston connected to said ramI6 stroke of said reciprocating member, stop means engageable with saidreciprocating stock feeding device to limit the stroke of said feedingdevice,

said pump being hydraulically connected with ing a pair of adjustablepistons drivingly con- 7 nected to said reciprocating stock feedingdevice, means for adjusting said pistons to regulate the stroke of saidreciprocating member, stop means engageable with said reciprocatingstock feeding device to limit the stroke of said feeding device, andmeans for cushioning the adjustablepistons at the'end of their stroke.6. A feed mechanism for punching, stamping and cutting machines having aplatform and a reciprocating head, a base adapted to be afIiXed to theplatform, pump means carried by the base and operatively connected tothe reciprocating head, a reciprocating member carried by the base forfeeding stock between the platform and head, a motor mounted on the basecontrolled by said pump means and drivingly connected to the reciprocating member, means for adjusting the stock of said reciprocatingmember, and means for cushioning the reciprocating member at the end ofits reciprocating stroke. 7 7. A feed mechanism for punching, stampingand cutting machines having a platform and a reciprocating head, a baseadapted to be ai'fixed to the platform, pump means carried by the baseand operatively connected to the reciprocating head, a reciprocatingmember carried by the base for feeding stock between the platform andhead,

'a motor mounted on the base controlled by said pump means and drivinglyconnected to the re ciprocating member, means for adjusting the stock ofsaid reciprocating member, and means for hydraulically connecting saidpumpmeans with said motor and including a reservoir chamber forreplenishing the motive fluid in said system whereby said system will becompletely filled during operation of said feeding mechanism.

8. A-feed mechanism forpunching, stamping and cutting machines havingaplatform and a reciprocating ram head, a support afiiXed to saidplatform, a pump carried by said support having a double-acting pistonconnected to said rain head in driven relationship therewith, areciprocating stock feeding device slidably mounted on said support, amotor carried by said support having a pair of adjustable pistonsdrivingly connected to said reciprocating stock feeding device, meansfor adjusting said pistons to regulate the stroke of saidreciprocatingmember, sto means engageable with said reciprocating stock feedingdevice to limit the stroke of said feeding device, and a screw shaft for,operablyconnecting said piston adjusting means with said' stop meanswhereby one of said adjustable pistons and stop means will be operatedsimultaneously,

rocating member, support means mounted onsaid bed having a guideway forfeeding stock between the bed and reciprocating member, a double-actingpiston type ump mounted on said support means connected to saidreciprocating member, a reciprocating stock feeding member mounted onsaid support for frictionally engaging said stock and feeding the sameforwardly, a double-acting piston type motor drivingly connected to saidreciprocating stock feeding member and hydraulically connected to saidpump, means for adjusting the stroke of said double-acting type motor,and means for cushioning the pistons of said motor as they reach the endof their stroke.

10. In a feed mechanism for punching, stamping and cutting machineshaving a bed and reciprocating member, support means mounted on said bedhaving a guideway for feeding stock between the bed and reciprocatingmember, a double-acting piston type pump mounted on said support meansconnected to said reciprocating member, a reciprocating stock feedingmember mounted on said support for frictionally engaging said stock andfeeding the same forwardly, a double-acting piston type motor drivinglyconnected to said reciprocating stock feeding member and hydraulicallyconnected to said pump, said double-acting motor being provided with apair of pistons mounted for relative movement one to the other, meansfor adjusting said' pistons toward and away from one another, stop meansfor limiting the reciprocating movement of said stock feeding member,and means interconnecting the piston adjusting means and stop meanswhereby said stock feeding means may be adjusted to vary the feed strokethereof.

11. In a feed mechanism for punching, stamping and cutting machineshaving a bed and reciprocating member, support means mounted on said bedhaving a guideway for feeding stock between the bed and reciprocatingmember, a double-acting piston type pump mounted on said support meansconnected to said reciprocating member, a reciprocating stock feedingmember mounted on said support for frictionally engaging said stock andfeeding the same forwardly, a double-acting piston type motor drivinglyconnected to said reciprocating stock feeding member and hydraulicallyconnected to said pump, said double-acting motor being provided with apair of pistons mounted for movement relative one to the other, meansfor adjusting said pistons toward and away from one another, stop meansfor limiting the reciprocating movement of said stock feeding member,meansinterconnecting the piston adjusting means and stop means wherebsaid stock feeding means may be adjusted to vary the feed strokethereof, and means for cushioning the pistons of said double-actingmotor as they approach the end of their stroke.

12. In a feed mechanism for punching, stamping and cutting machineshaving a bed and reciprocating member, support means mounted on 18 theirstroke, said double-acting piston type pump being provided with areservoir chamber to receive excess motive fluid when the stroke of thefeed mechanism is varied.

13. In a feed mechanism for punching, stamping and cutting machineshaving a bed and reciprocating member, support means mounted on said bedhaving a guideway for feeding stock between the bed and reciprocatingmember, a double-acting piston type pump mounted on said sup-port meansconnected to said reciprocating member, a reciprocating stock feedingmember mounted on said support for frictionally engaging said stock andfeeding the same forwardly, a double-acting piston type motor drivinglyconnected to said reciprocating stock feeding member and hydraulicallyconnected to said pump, means for adjusting the stroke of saiddoubleacting type motor, means for cushioning the pistons of said motoras they reach the end of their stroke, said pum being provided with areservoir chamber for replenishing the hydraulic system with motivefluid, and by-pass valve means interposed between the ends of thedouble-acting piston type pump and said reservoir for returning excessmotive fluid to said reservoir when the stroke of said stock feedingmember is varied and shortened.

14. In a feed mechanism for punching, stamping and cutting machines,having a work support and reciprocating head member, support meansaffixed to said work support, guide means on said support means, areciprocating stock feeding slide mounted in said guide means, a pivotedstock gripping dog carried by said slide adapted to frictionally engagethe stock and feed the same forwardly beneath said work support andreciprocating member, means carried by the support means for preventingretrograde movement of said stock during the return stroke of saidslide, a pump chamber formed in said support means, a pair of pistonsmounted in said chamber having valve ports therein, a doubleended valvemember slidably connecting said pistons adapted to alternately open andclose the ports in said pistons, means for connecting said double-actingvalve member to said reciprocating head member, a double-acting motormounted on said support means, a plunger rod xtending into said motorslidably connected with the reciprocating stock feeding member andpivotally secured to said gripping dog, a piston carried by said plungerrod, a second piston connecting said pistons to permit separationthereof, port means connecting the ends of said pump chamber with therespective ends of said motor, an adjustable stop carried by saidsupport means, and means interconnecting said stop means andsecond-mentioned piston to facilitate adjustment of the stroke of saidreciprocating stock feeding slide,

15. In a feed mechanism for punching, stamping and cutting machineshaving a work support and reciprocating head member, support meansafiixed to said work support, guide means on said support means, areciprocating stock feeding slide mounted in said guide means, a pivotedstock gripping dog carried by said slide adapted to frictionally engagethe stock and feed the same forwardly beneath said work support andreciprocating member, means carried by the support means for preventingretrograde movement of said stock during the return stroke of saidslide, a pump chamber formed in said support means, a p ir of pistonsmounted in said chamber havmg valve ports therein, a-. double-endedvalve member slidably connecting-said pistons '-adapted to alternatelyopen and" closethe ports insaid pistons, means for connectingsaidrdouble-acting valve member to said reciprocating head member, adouble-acting motor mounted on said support means, a plunger rodextendinginto said motor slidably connected with the reciprocating stockfeedingmember andpivotallysecured to said gripping dog, at pistoncarriedby stock feeding member before being engaged by said stop means;

16; In a feed mechanism forpunchin'g; stamping and cutting machineshaving a: Work: support and reciprocating head member,. support meansaffixed to said work support; guidemeans on said support means, areciprocating stock feedingslid'e mounted in said guide means, a pivotedstock gripping dog carried bysaid slideadapted to frictionally engagethesto'cls and feedzthe'same forwardly beneath" said Work supporti andreciprocating member, means: carried by the sup port means forpreventing retrograde-movement of said stock during the return: st-ro'keof-said slide, apump chamber formed in said support means,- a pair ofpistonsmounted in said" chamber having valve-ports therein-,-. a:double-endedvalve member s'lidablyconnecting; said pistons adapted V toalternately open and close the ports ini-said pistons, meansforconnecting; said doubl'e acting valve member to saidreciprocating headmem ber, a double-acting-motorf-mounted onrsaid sup port means,a-plunger rod extending; into-said motor slidably connected withvthereciprocating stock feeding member and pivotally' secured to saidgripping dog, apistonca-rriedby saidiplunger rod, a second pistonconnecting'said pistons to permit separation thereof, port meansconnecting the ends of said: pump: chamber withtherespective ends of:sai'd 'motor, an adjustable-stop carried by said support means, and.means interconnecting saidstopmeans and second-mentioned" pistontofacilitate adjustment of the stroke of said reciprocating stock:feeding-slide, said pump chamber being provided with areser voir chamberand-by-passmeans between said pump chamber and reservoir chamber topermit the return of excessmotive fiuid to said reservoir chamber whenthe stroke of-saidreci-procating stock feeding slide is adjusted;

17. In a feed mechanism for punching, stain-p? ing and cutting machineshaving a work support and reciprocating head member, support'mea-nsafiixed to said work'support,..guidemeans on said support means, areciprocating stock feeding j slide mounted in said guide means-,. a;pivoted stockgripping dog carried by said slide adaptedtofriction-ally'engage the stock and feedthe'same forwardlybeneathrsaidiwork support and reciprocating member, means carried bythesupport means for preventingretrogradamovement of i said Stock during.the return stroke oi said slide, a

pump chamber formed in: said support-means, a pair of pistons-mountedinsaid chamber having valve ports therein, adouble-ended valvemembergripping dog, apistoncarriedby' said plunger rod,

asecond piston connectingsaid: pistons to permit separation thereof,port. means: connectingthe ends of said pump.chamberywith.the-respective ends of said-motor, an adjustable stopcarriedby said supportmeans, and:- manually operable means connecting:the. stop-means-and said second-mentioned piston .to -facilitateadjustment-of said piston andstop means in, unison:

18., Ina feed mechanismfor punching, stamping and cutting machineshavingazworksupport and reciprocating head. member,.support means affixed .tosaid work support, ,guide means on. said supportmeans, a reciprocatinstock feeding slide mounted in said: guide-means;. a pivoted. stockgripping-v dog-"carried by saidslideadapted to fricticnally engage thestochandfeed the same-forwardly beneath said work. supportandreciprocating member; means carried-by the: support means for preventingretrograde movement of saidstock during, the return strokezof saidslide, a pump chamber formed in, said support means, a pair, ofpistonsmounted-in. said chamber having valve. ports therein, a double-endedvalve member slidably connecting saidpistons adapted to: alternatelyopen and. close. the ports in. said pistons, means-:for connectingsaiddouble-acting valvemember. tosaidreciprocating. head member, a.double=acting= motor mounted -onsaid support means, a plunger rodextending intosaid motor slidably connected with the reciprocating stockfeeding member and pivotally secured to said gripping dog, afpistoncarriedby said-plungerrod', asecondpiston connecting said pistons to.per mit separationzthereof,,port, means connecting the ends of said pumpchamber with the respectiveends' of said motor, an adjustablerstop: careriedi by said support means, and meansiforindir. eating the lineardistance themotor pistons and stop means have. been. adjusted. V

1-9; In afeed mechanis-miior punching, stamping: and cutting- .machines.having awork support and reciprocating'head member, support meansafiixed to said worksupport,guidemeans on'said support means,a-reci-proeating-stock feedingslide mounted in said guidemeansae-pivoted' stock gripping dogcarried "by-said slidezadapted. tofriction-allyengage the stock and teed: the same for wardlybeneath saidwork. support and recipro eating member, means carried by the supportmeans for preventing retrograde movement. of said stock during, thereturn-strokeoi said slide,

arpu-m-p chamber formed said supportmeans;

a pair of pistons? mounted in'said chamber having valve ports therein, adouble-ended valve member slidably connecting. saidpistons adaptedtoalternately open. and close the ports in said, pistons, means forconnecting saidv double-acting. valve. member tosaid. reciprocating headmem--- ber, a double-acting motor mounted on said sup port means, aplunger rod extending into saidmotor slidably connected Withthereciprocating, stool: ieeding member andpivotally secured to.-

tive ends of said motor, an adjustable stop carried by said supportmeans, means interconnecting said stop means and second-mentioned pistonto facilitate adjustment of the stroke of said reciprocating stockfeeding slide, said pump chamber being provided with a reservoirchamber, and a spring loaded dash pot structure communicating with saidreservoir chamber to place the fluid therein under initial pressure.

20. A fluid transmission system, comprising motor means, pump meanshydraulically connected to said motor means for operating said motormeans, adjustable pistons mounted in said motor means to regulate thestroke thereof, and a feservoir associated with the system for receivingexcess fluid when the stroke of said motor means is regulated byadjusting said pistons.

21. A fluid transmission system, comprising a fluid motor of thereciprocating piston type, pumpmeans in said system hydraulicallyconnected to the motor means for operating said motor means, said motormeans including a pair of adjustable piston members arranged to be movedtoward and away from one another to regulate the stroke of said motormeans, means for regulating said pistons, and reservoir means associatedwith said system for receiving excess fluid therefrom when said pistonsare adjusted to shorten the stroke of said motor.

22. A fluid transmission system for feeding mechanisms, comprising areciprocating piston type motor, a pair of pistons mounted in saidmotor, a plunger rod connecting said pistons, means for adjusting saidpistons on said plunger rod for regulating the stroke of the plungerrod, pump means operatively and hydraulically connected with said motorfor reciprocating said piston and plunger rod, reservoir means havingcommunication with said pump means, and means associated with saidsystem for allowing excess fluid therein to be returned to saidreservoir means when the pistons in said motor are adjusted forreciprocating strokes smaller than the cylinder length of said motor.

23. A fluid transmission system for feeding mechanisms, comprising areciprocating piston type motor, a pair of pistons mounted in saidmotor, a plunger rod connecting said pistons, means for adjusting saidpistons on said plunger rod for regulating the stroke of the plungerrod, pump means operatively and hydraulically connected with said motorfor reciprocating said piston and plunger rod, reservoir means havingcommunication with said pump means, means associated with said systemfor allowing excess fluid therein to be returned to said reservoir meanswhen the pistons in said motor are adjusted for reciprocating strokessmaller than the cylinder length of said motor, and means for cushioningsaid pistons as they reach the end of their stroke.

24. A fluid transmission system, comprising a fluid motor of thereciprocating piston type, pump means in said system hydraulicallyconnected to the motor means for operating said motor means, said motormeans including a pair of adjustable piston members arranged to be movedtoward and away from one another to regulate the stroke of said motormeans, means for regulating said pistons, reservoir means associatedwith said system for receiving excess fluid therefrom when said pistonsare adjusted to shorten the stroke of said motor, and a spring-loadeddash pot structure associated with said pump means to impose a slightpressure on said system and thereby permit operation of said system invarious angular positions.

JOHN HALLER.

REFERENCES CITED UNITED STATES PATENTS Number Name Date Haller June 26,1945

